As said before. I only have UTP cable to the different locations. If you replace the MD by PVR/STB and cables then you increasing complexity and costs instead of decreasing it imho. Even though then the MD might fail I have more trust in something open then the closed smarttv, PVR/STB. Especially if it is possible to have _one_ cheap but fully working solution so all use the same. I still feel the core needs to have all connections directly feed into it and there need to be light players/controllers that can actually be controlled (like also softwarewise) whatever that might be ;-).
In these situations just place a small 4-port switch in the room behind your TV etc and the connect your devices to the switch. A switch is super reliable, low cost and very low energy. We'be used this config in 100's of professional installations and it has proven to work well and be incredibly reliable.
All the best